US3393207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing phthalic anhydride
Assignee: Nippon Shokubai Co Ltd
•
Filing: 1965-09-17
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Granted: 1968-07-16
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Expires: 1985-09-17
Abstract
No abstract record available.
Inventors
- 👤 Ono Tetsuji
- 👤 Okuda Yukio
- 👤 Oda Kenzo
- 👤 Sakuyama Shigeru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:16
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/002; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; B01J27/199; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/255; C07C51/265; B01J2523/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-16 | 1972-01-15 | 1972-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-16 | 1976-01-15 | 1976-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-16 | 1980-01-15 | 1980-07-16 | $7700.00 | Window Closed / Lapsed |